Written by Ever gotten this for apparently no reason? 
Well, this error is quite interesting. This error is triggered every time you have a capital CR in either the path to file or the file itself. You did not guessed that? Me neither.
I stumbled over this problem in regards of OCR read pdf documents. Yepp….. OCR.
Anyway the fix is pretty simple, just add the following registry key:
HKEY_LOCAL_MACHINESOFTWAREAdobeAdobe Acrobat10.0AdobeViewer
"EULAAcceptedForBrowser"=dword:00000001
You can see on this forum post that Adobe is aware of the problem:
http://forums.adobe.com/message/3791868